Sundance Film Festival co-founder Gary Beer spent 15 years helping to build the annual Park City, Utah, event into a leading showcase for up-and-coming filmmakers. Now he hopes to do the same for actors. Describing his new Web venture, StarCast Auditions, Beer explains, “We’re a filter and vetting service that says to the public at large: ‘If you think you can act, send us your audition tape.”